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问题
单项选择题 A1型题
一种药物的毒性烈性能被另一种药物消除，这种配伍关系是（）
A.相恶
B.相杀
C.相畏
D.相须
E.相反
答案
参考答案：C
选择题
下列实验基本操作中，正确的是
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选择题
Sales of CDs have greatly increased since the early 1990s, when people _______to enjoy the advantages of this new technology.
A. begin
B. began
C. have begun
D. had begun
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